Physiological Responses of Alfalfa to High-level Salt Stress: Root Ion Flux and Stomatal Characteristics

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	Physiological Responses of Alfalfa to High-level Salt Stress: Root Ion Flux and Stomatal Characteristics
	P. Guo, H. X. Wei, W. J. Zhang and Y. J. Bao
刊名	International Journal of Agriculture and Biology
	2016
卷号	18 期号:1 页码:125-133
中文摘要	Alfalfa is an important salt-tolerant leguminous forage-plant in salinity areas worldwide, but its performance in high level of salt stress cannot meet the satisfactory requirement. Especially, the short-term response of alfalfa to high-level salt stress is still not clear. In the present study, thirty-day-old alfalfa Gongnong No. 1 (Medicago sativa L. cv. Gongnong No. 1) seedlings were exposed to NaCl treatments at concentrations of 0 (control), 50 (moderate level), 150 (high level), and 250 mM (extremely high level). Twenty-four hours after salt stress treatment, with the increase of NaCl level plant height was slightly decreased but both shoot biomass and root length were substantially declined to a dramatic extent. Also decreased was root K+ concentration. In contrast, both Na+ concentration and ratio of K+/Na+ showed increased trends. Root K+ flux was determined using non-invasive micro-test technique (NMT) around apical root tips, wherein a clear K+ influx was observed at the rate of about 0.5 nmol cm(-2) s(-1) under the condition without salt stress, while under salt stress at the rate of 2. 3 nmol cm(-2) s(-1) did occur K+ efflux. Accordingly, stomatal length and breadth and stomatal aperture breadth decreased with the increase of NaCl concentration, while stomatal aperture density increased with time in the first 24 h after NaCl treatment. In conclusion, as a species-specific test, alfalfa is sensitive to high-level salinity with NaCl concentrations above 150 mM in the first 24 h post salt-exposure. The key mechanism was found to be presented as the pressed stamatal conductance induced by K+-Na+ unbalance which was caused by root K+ efflux. (C) 2016 Friends Science Publishers
内容类型	期刊论文
源URL	[http://159.226.123.10/handle/131322/7064]
专题	东北地理与农业生态研究所_湿地生态系统管理学科组_期刊论文
推荐引用方式 GB/T 7714	P. Guo, H. X. Wei, W. J. Zhang and Y. J. Bao. Physiological Responses of Alfalfa to High-level Salt Stress: Root Ion Flux and Stomatal Characteristics[J]. International Journal of Agriculture and Biology,2016,18(1):125-133.
APA	P. Guo, H. X. Wei, W. J. Zhang and Y. J. Bao.(2016).Physiological Responses of Alfalfa to High-level Salt Stress: Root Ion Flux and Stomatal Characteristics.International Journal of Agriculture and Biology,18(1),125-133.
MLA	P. Guo, H. X. Wei, W. J. Zhang and Y. J. Bao."Physiological Responses of Alfalfa to High-level Salt Stress: Root Ion Flux and Stomatal Characteristics".International Journal of Agriculture and Biology 18.1(2016):125-133.